Android仿网络直播弹幕功能的实现
Posted shineflowers
tags:
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现在网络直播越来越火,网络主播也逐渐成为一种新兴职业,对于网络直播,弹幕功能是必须要有的,如下图:
首先来分析一下,这个弹幕功能是怎么实现的,首先在最下面肯定是一个游戏界面View,然后游戏界面上有弹幕View,弹幕的View必须要做成完全透明的,这样即使覆盖在游戏界面的上方也不会影响到游戏的正常观看,只有当有人发弹幕消息时,再将消息绘制到弹幕的View上面就可以了,下方肯定还有有操作界面View,可以让用户来发弹幕和送礼物的功能,原理示意图如下所示:
参照原理图,下面一步一步来实现这个功能。
实现视频的播放
activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000">
<VideoView
android:id="@+id/video_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"/>
</RelativeLayout>
MainActivity.java
package com.jackie.bombscreen;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.VideoView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
VideoView videoView = (VideoView) findViewById(R.id.video_view);
videoView.setVideoPath(Environment.getExternalStorageDirectory() + "/xiaoxingyun.mp4");
videoView.start();
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus && Build.VERSION.SDK_INT >= 19) {
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
}
最后别忘了设置AndroidMainfest.xml
效果如下:
实现弹幕的效果
接下来我们开始实现弹幕效果。弹幕其实也就是一个自定义的View,它的上面可以显示类似于跑马灯的文字效果。观众们发表的评论都会在弹幕上显示出来,但又会很快地移出屏幕,既可以起到互动的作用,同时又不会影响视频的正常观看。
我们可以自己来编写这样的一个自定义View,当然也可以直接使用网上现成的开源项目。那么为了能够简单快速地实现弹幕效果,这里我就准备直接使用由哔哩哔哩开源的弹幕效果库DanmakuFlameMaster。
DanmakuFlameMaster库的项目主页地址是:https://github.com/Bilibili/DanmakuFlameMaster
添加build.gradle依赖
compile 'com.github.ctiao:DanmakuFlameMaster:0.5.3'
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000">
<VideoView
android:id="@+id/video_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"/>
<master.flame.danmaku.ui.widget.DanmakuView
android:id="@+id/danmaku_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
修改MainActivity.java
package com.jackie.bombscreen;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.VideoView;
import java.util.Random;
import master.flame.danmaku.controller.DrawHandler;
import master.flame.danmaku.danmaku.model.BaseDanmaku;
import master.flame.danmaku.danmaku.model.DanmakuTimer;
import master.flame.danmaku.danmaku.model.IDanmakus;
import master.flame.danmaku.danmaku.model.android.DanmakuContext;
import master.flame.danmaku.danmaku.model.android.Danmakus;
import master.flame.danmaku.danmaku.parser.BaseDanmakuParser;
import master.flame.danmaku.ui.widget.DanmakuView;
public class MainActivity extends AppCompatActivity {
private boolean mIsShowDanmaku;
private DanmakuView mDanmakuView;
private DanmakuContext mDanmakuContext;
private BaseDanmakuParser parser = new BaseDanmakuParser() {
@Override
protected IDanmakus parse() {
return new Danmakus();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
VideoView videoView = (VideoView) findViewById(R.id.video_view);
videoView.setVideoPath(Environment.getExternalStorageDirectory() + "/xiaoxingyun.mp4");
videoView.start();
mDanmakuView = (DanmakuView) findViewById(R.id.danmaku_view);
mDanmakuView.enableDanmakuDrawingCache(true);
mDanmakuView.setCallback(new DrawHandler.Callback() {
@Override
public void prepared() {
mIsShowDanmaku = true;
mDanmakuView.start();
generateSomeDanmaku();
}
@Override
public void updateTimer(DanmakuTimer timer) {
}
@Override
public void danmakuShown(BaseDanmaku danmaku) {
}
@Override
public void drawingFinished() {
}
});
mDanmakuContext = DanmakuContext.create();
mDanmakuView.prepare(parser, mDanmakuContext);
}
/**
* 向弹幕View中添加一条弹幕
* @param content 弹幕的具体内容
* @param withBorder 弹幕是否有边框
*/
private void addDanmaku(String content, boolean withBorder) {
BaseDanmaku danmaku = mDanmakuContext.mDanmakuFactory.createDanmaku(BaseDanmaku.TYPE_SCROLL_RL);
danmaku.text = content;
danmaku.padding = 5;
danmaku.textSize = sp2px(20);
danmaku.textColor = Color.WHITE;
danmaku.setTime(mDanmakuView.getCurrentTime());
if (withBorder) {
danmaku.borderColor = Color.GREEN;
}
mDanmakuView.addDanmaku(danmaku);
}
/**
* 随机生成一些弹幕内容以供测试
*/
private void generateSomeDanmaku() {
new Thread(new Runnable() {
@Override
public void run() {
while(mIsShowDanmaku) {
int time = new Random().nextInt(300);
String content = "" + time + time;
addDanmaku(content, false);
try {
Thread.sleep(time);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
/**
* sp转px的方法。
*/
public int sp2px(float spValue) {
final float fontScale = getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
@Override
protected void onPause() {
super.onPause();
if (mDanmakuView != null && mDanmakuView.isPrepared()) {
mDanmakuView.pause();
}
}
@Override
protected void onResume() {
super.onResume();
if (mDanmakuView != null && mDanmakuView.isPrepared() && mDanmakuView.isPaused()) {
mDanmakuView.resume();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
mIsShowDanmaku = false;
if (mDanmakuView != null) {
mDanmakuView.release();
mDanmakuView = null;
}
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus && Build.VERSION.SDK_INT >= 19) {
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
}
效果图如下:
加入操作界面
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000">
<VideoView
android:id="@+id/video_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"/>
<master.flame.danmaku.ui.widget.DanmakuView
android:id="@+id/danmaku_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:id="@+id/operation_layout"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="#fff"
android:visibility="gone">
<EditText
android:id="@+id/edit_text"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1" />
<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Send" />
</LinearLayout>
</RelativeLayout>
package com.jackie.bombscreen;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.VideoView;
import java.util.Random;
import master.flame.danmaku.controller.DrawHandler;
import master.flame.danmaku.danmaku.model.BaseDanmaku;
import master.flame.danmaku.danmaku.model.DanmakuTimer;
import master.flame.danmaku.danmaku.model.IDanmakus;
import master.flame.danmaku.danmaku.model.android.DanmakuContext;
import master.flame.danmaku.danmaku.model.android.Danmakus;
import master.flame.danmaku.danmaku.parser.BaseDanmakuParser;
import master.flame.danmaku.ui.widget.DanmakuView;
public class MainActivity extends AppCompatActivity {
private boolean mIsShowDanmaku;
private DanmakuView mDanmakuView;
private DanmakuContext mDanmakuContext;
private BaseDanmakuParser parser = new BaseDanmakuParser() {
@Override
protected IDanmakus parse() {
return new Danmakus();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
VideoView videoView = (VideoView) findViewById(R.id.video_view);
videoView.setVideoPath(Environment.getExternalStorageDirectory() + "/xiaoxingyun.mp4");
videoView.start();
mDanmakuView = (DanmakuView) findViewById(R.id.danmaku_view);
mDanmakuView.enableDanmakuDrawingCache(true);
mDanmakuView.setCallback(new DrawHandler.Callback() {
@Override
public void prepared() {
mIsShowDanmaku = true;
mDanmakuView.start();
generateSomeDanmaku();
}
@Override
public void updateTimer(DanmakuTimer timer) {
}
@Override
public void danmakuShown(BaseDanmaku danmaku) {
}
@Override
public void drawingFinished() {
}
});
mDanmakuContext = DanmakuContext.create();
mDanmakuView.prepare(parser, mDanmakuContext);
final LinearLayout operationLayout = (LinearLayout) findViewById(R.id.operation_layout);
final Button send = (Button) findViewById(R.id.send);
final EditText editText = (EditText) findViewById(R.id.edit_text);
mDanmakuView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (operationLayout.getVisibility() == View.GONE) {
operationLayout.setVisibility(View.VISIBLE);
} else {
operationLayout.setVisibility(View.GONE);
}
}
});
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String content = editText.getText().toString();
if (!TextUtils.isEmpty(content)) {
addDanmaku(content, true);
editText.setText("");
}
}
});
getWindow().getDecorView().setOnSystemUiVisibilityChangeListener (new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
if (visibility == View.SYSTEM_UI_FLAG_VISIBLE) {
onWindowFocusChanged(true);
}
}
});
}
/**
* 向弹幕View中添加一条弹幕
* @param content 弹幕的具体内容
* @param withBorder 弹幕是否有边框
*/
private void addDanmaku(String content, boolean withBorder) {
BaseDanmaku danmaku = mDanmakuContext.mDanmakuFactory.createDanmaku(BaseDanmaku.TYPE_SCROLL_RL);
danmaku.text = content;
danmaku.padding = 5;
danmaku.textSize = sp2px(20);
danmaku.textColor = Color.WHITE;
danmaku.setTime(mDanmakuView.getCurrentTime());
if (withBorder) {
danmaku.borderColor = Color.GREEN;
}
mDanmakuView.addDanmaku(danmaku);
}
/**
* 随机生成一些弹幕内容以供测试
*/
private void generateSomeDanmaku() {
new Thread(new Runnable() {
@Override
public void run() {
while(mIsShowDanmaku) {
int time = new Random().nextInt(300);
String content = "" + time + time;
addDanmaku(content, false);
try {
Thread.sleep(time);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
/**
* sp转px的方法。
*/
public int sp2px(float spValue) {
final float fontScale = getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
@Override
protected void onPause() {
super.onPause();
if (mDanmakuView != null && mDanmakuView.isPrepared()) {
mDanmakuView.pause();
}
}
@Override
protected void onResume() {
super.onResume();
if (mDanmakuView != null && mDanmakuView.isPrepared() && mDanmakuView.isPaused()) {
mDanmakuView.resume();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
mIsShowDanmaku = false;
if (mDanmakuView != null) {
mDanmakuView.release();
mDanmakuView = null;
}
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus && Build.VERSION.SDK_INT >= 19) {
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
}
效果图如下:
自己发的弹幕有绿色边框,很容易区分。
基本上实现了弹幕的功能,当然,里面的知识点还有很多,这只是最基本的功能。有时间的话,建议学学DanmakuFlameMaster,里面还有很多炫酷的功能。
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